The Immaculate Conception of the Blessed Virgin Mary - Holy Day of Obligation

The Solemnity of the Immaculate Conception celebrates the solemn celebration of belief in the Immaculate Conception of the Virgin Mary. It is universally celebrated nine months before the feast of the Nativity of Mary, which is celebrated on September 8. The Immaculate Conception is one of the most important Marian feasts in the liturgical calendar of the Roman Catholic Church, and is celebrated worldwide.